JPS55132521A - Recording circuit for flexible disc unit - Google Patents

Recording circuit for flexible disc unit

Info

Publication number
JPS55132521A
JPS55132521A JP4009279A JP4009279A JPS55132521A JP S55132521 A JPS55132521 A JP S55132521A JP 4009279 A JP4009279 A JP 4009279A JP 4009279 A JP4009279 A JP 4009279A JP S55132521 A JPS55132521 A JP S55132521A
Authority
JP
Japan
Prior art keywords
capacitor
erase
coil
recording circuit
flexible disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4009279A
Other languages
Japanese (ja)
Inventor
Hidekazu Nishino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4009279A priority Critical patent/JPS55132521A/en
Publication of JPS55132521A publication Critical patent/JPS55132521A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/465—Arrangements for demagnetisation of heads

Landscapes

  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To demagnetize the erase core of magnetic head, by producing the attenuated oscillation through the addition of the capacitive circuit element to a part of the recording circuit. CONSTITUTION:The capacitor C is inserted in parallel with the erase coil L and the internal resistance r of the coil, charges are stored in the capacitor with the DC power supply V immediately after the transistor Tr is switched off, and the operation after that is equivalent as the transient phenomenon at the discharge of the capacitor C when the switch is from ON to OFF. When the values of the erase coil L, capacitor C and the internal resistance r are set to suitable values, the current i flowing to the erase coil L is in attenuated oscillation. The erase core 2 is automatically demagnetized with the current i in attenuated oscillation.
JP4009279A 1979-04-03 1979-04-03 Recording circuit for flexible disc unit Pending JPS55132521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4009279A JPS55132521A (en) 1979-04-03 1979-04-03 Recording circuit for flexible disc unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4009279A JPS55132521A (en) 1979-04-03 1979-04-03 Recording circuit for flexible disc unit

Publications (1)

Publication Number Publication Date
JPS55132521A true JPS55132521A (en) 1980-10-15

Family

ID=12571235

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4009279A Pending JPS55132521A (en) 1979-04-03 1979-04-03 Recording circuit for flexible disc unit

Country Status (1)

Country Link
JP (1) JPS55132521A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121369A (en) * 1989-05-25 1992-06-09 International Business Machines Corporation Method and apparatus for direct overwriting information on a magneto-optical recording medium using constant laser beam modulated magnetic field generator
US5233577A (en) * 1987-10-14 1993-08-03 U.S. Philips Corp. Magneto-optical recording apparatus and energizing circuit for use in such a magneto-optical recording apparatus
US5448422A (en) * 1990-11-16 1995-09-05 Canon Kabushiki Kaisha Magnetic head drive circuit including capacitors for storing charge to drive a magnetic head coil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826773A (en) * 1971-08-05 1973-04-09

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826773A (en) * 1971-08-05 1973-04-09

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233577A (en) * 1987-10-14 1993-08-03 U.S. Philips Corp. Magneto-optical recording apparatus and energizing circuit for use in such a magneto-optical recording apparatus
US5121369A (en) * 1989-05-25 1992-06-09 International Business Machines Corporation Method and apparatus for direct overwriting information on a magneto-optical recording medium using constant laser beam modulated magnetic field generator
US5448422A (en) * 1990-11-16 1995-09-05 Canon Kabushiki Kaisha Magnetic head drive circuit including capacitors for storing charge to drive a magnetic head coil

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